class myBatch
{
	// commonly required method put into parent 
	// class referencing properties defined in child
	public function sumNums()
	{
             return array_sum($this->nums);
	}
        public function setNums($nums)
        {//validation here
             $this->nums=array_merge($this->nums,$nums);
        }
}

class myBatchClientTrustGicPurchase extends myBatch
{
	// properties specific to the extending class
        function __construct() {
           $this->setNums(1,5,18);
           echo $this->sumNums();
        }
}

class myBatchClientTrustGicPurchase extends myBatch
{
	// properties specific to the extending class
        function __construct() {
           $this->setNums(100,9,47);
           echo $this->sumNums();
        }

}